<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>动画循环</title>
    <style>
        section {
            padding: 10px;
        }
    </style>
</head>
<body>
    <canvas id="canvas" width="500" height="500"></canvas>
    <h1>动画循环</h1>
    <section>
        <ul>
            <li>初始化</li>
            <li>动画循环（更新、清除、绘制）</li>
            <li>结束动画循环</li>
        </ul>
    </section>
    <script>
        
    </script>
</body>
</html>